Avanti is a free mail client that works with SMTP and POP3, it is light and fast, supporting multiple mail accounts, and also HTML and plaint text format. It has a different style of messages preview, not like other tools.
Avanti has a features called mail manager, you can get a quick preview of the header of the email on POP3 server, also you are able to choose message to download and delete unnecessary messages from server.
Avanti also supporting quick check for new messages in your inbox, just like the other tools, avanti also has a contact book. You are able to configure templates for further purpose with special variables. And in common, avanti featyres i using on a rewritable devices, you can use avanti on a portable drive, it is only requiring an internet connections.